Placidity used in a sentence

Placidity in a sentence as a noun

The cow, being a marvel of well-bred placidity, just moo'ed and carried on chewing its cud.

I've seen a cop's face go from suspicious anger to placidity from a smooth handling of their concerns.

You're attempting to justify these actions with placidity?Yes, embassies are bugged, it happens, as does rape.

Typically this type of placidity takes a long time of historic reinforcement to generate.